On systems which had dev-python/configparser installed (a package
to add support for the py3.x configparser class in py2.x)
webapp-config would make use of that class instead of py2.x's built
in ConfigParser class. This would lead to improper interpolation of
configuration variables that follow the syntax "${<var>}". This
dangerous behavior could (and has) lead to webapp-config installing
a webapp to the root filesystem of a host. This danger has been
avoided by modifying the import strategy for the config parser we're
using so that we force import the ConfigParser class if using py2.x.
X-Gentoo-Bug: 528752
X-Gentoo-Bug-URL: https://bugs.gentoo.org/528752